Abstract: A band selection guide is provided to help determine an exact size of a tooth, such as a molar, for example. The band selection guide is intended for single use and may be disposable. The band selection guide includes a tapered body having opposed proximal and distal ends, where the proximal end is larger than the distal end. A number of size markings appear on the tapered body near the distal end to indicate the size of a patient's tooth. A vertical slit is formed through the tapered body, such that the tapered body may be looped, with the distal end being inserted through the vertical slit. The band selection guide is placed around a tooth to be measured, with the size marking which aligns with the vertical slit indicating the size of the tooth.